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	id是没有上下文的
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<script>
	if( match && (match[1] || !context) ) {//120行   $('<li>') -> match = [ null, '<li>', null ]    $('<li>1</li><li>2</li>') -> match = [ null, '<li>1</li><li>2</li>', null ]      $('<li>hello')-> match=['<li>hello','<li>',null]  $('#div1')-> match=['#div1',null,'div1']
		



	if ( match[1] ) { //123行 进一步判断$('<li>') -> match = [ null, '<li>', null ]    $('<li>1</li><li>2</li>') -> match = [ null, '<li>1</li><li>2</li>', null ]      $('<li>hello')-> match=['<li>hello','<li>',null]
		// 判断上下文124行  
	} else {  //150行  $('#div1')-> match=['#div1',null,'div1']
</script>